Diamond Light Source, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, UK.
J Synchrotron Radiat. 2011 Jul;18(Pt 4):637-48. doi: 10.1107/S0909049511013641. Epub 2011 May 17.
The commissioning and performance characterization of a position-sensitive detector designed for fast X-ray powder diffraction experiments on beamline I11 at Diamond Light Source are described. The detecting elements comprise 18 detector-readout modules of MYTHEN-II silicon strip technology tiled to provide 90° coverage in 2θ. The modules are located in a rigid housing custom designed at Diamond with control of the device fully integrated into the beamline data acquisition environment. The detector is mounted on the I11 three-circle powder diffractometer to provide an intrinsic resolution of Δ2θ approximately equal to 0.004°. The results of commissioning and performance measurements using reference samples (Si and AgI) are presented, along with new results from scientific experiments selected to demonstrate the suitability of this facility for powder diffraction experiments where conventional angle scanning is too slow to capture rapid structural changes. The real-time dehydrogenation of MgH(2), a potential hydrogen storage compound, is investigated along with ultrafast high-throughput measurements to determine the crystallite quality of different samples of the metastable carbonate phase vaterite (CaCO(3)) precipitated and stabilized in the presence of amino acid molecules in a biomimetic synthesis process.
描述了一种专为在英国钻石光源 I11 光束线上进行快速 X 射线粉末衍射实验而设计的位置灵敏探测器的调试和性能表征。探测元件包括 18 个 MYTHEN-II 硅条技术的探测器读出模块，这些模块拼接在一起，可在 2θ 方向提供 90°的覆盖范围。模块位于钻石公司定制的刚性外壳中，设备的控制完全集成到光束线数据采集环境中。探测器安装在 I11 三圆粉末衍射仪上，可提供固有分辨率 Δ2θ 约为 0.004°。介绍了使用参考样品（Si 和 AgI）进行调试和性能测量的结果，以及来自科学实验的新结果，这些实验旨在证明该设备适用于粉末衍射实验，其中常规角度扫描太慢，无法捕捉快速结构变化。研究了潜在储氢化合物 MgH(2)的实时脱氢过程，以及超快高通量测量，以确定在生物模拟合成过程中氨基酸分子存在下沉淀和稳定的亚稳态碳酸盐相文石（CaCO(3)）的不同样品的微晶质量。
